Web-IO 4.0 Digital 4x In / Out


With the Web-IO 4.0 Digital switching signals can be controlled, detected and monitored over TCP/IP-Ethernet. The 4 switching channels can be used as input or output. Numerous Web and network services are available for reporting changes on the inputs and outputs – including directly in the browser. Using protocols such as OPC UA, MQTT and REST the Web-IO is an ideal fit in the world of Industry 4.0 and the Internet of Things.

Manufacturer: Wiesemann & Theis / Country of Origin: Germany

Switching signals:

  • 4 channels
    • Can be used optionally as inputs or outputs
    • 24V technology
    • Switching currents up to 500mA
    • 32-bit pulse counter


  • Intuitive Web interface for simpler operation
    • Select between German or English
    • Switching the outputs directly from the Web interface
    • Adaptation for smartphone
    • HTTP and HTTPS
  • Current Industry 4.0 protocols:
    • OPC UA, REST and MQTT support
    • AMQP on request
  • Box-to-Box
    • Pass switching signals over the network 1:1
  • Alarm and reporting functions:
    • Email for alarm sending or as status report
    • SNMP polling / alarm traps
    • Switching your outputs in alarm situations
    • Switching the outputs on another Web-IO
    • HTTP requests for controlling third-party devices
    • Up to 30 actions can be configured
  • Dynamic integration into other Web sites:
    • Direct access to current states via HTTP requests, AJAX and JavaScript
  • Additional software interfaces for incorporating into your systems/databases:
    • OPC UA, OPC DA
    • Modbus TCP
    • Syslog
    • TCP and UDP sockets, client and server
    • FTP (data logging)
  • Internal clock
    • Time synchronization via time server calibration
    • Battery-backed device clock
  • Possible applications:
    • Remote monitoring and fault messaging
    • Cross-location switching
    • House and building automation
    • Process monitoring and visualization
    • Light, gate and cabinet control
    • Machine Data Collection (MDC)
    • More uses can be found here.

Power supply:

  • External power
    • Screw terminal
    • 12 – 24V DC

Standards & more

  • Conforms to standards both in office and industrial environments:
    • High noise resistance for industrial environments
    • Low noise emission for residential and business areas
  • 5 year guarantee

Connections, displays and control elements:

Digital in-/outputs: 4 channels can be used optionally as in- or output
Output for 12-24V, max. 500mA
max. total current 2A
Using our coupling relays voltages of even up to
230V can be switched
Input voltage +/-30V
protected against reverse connection within this range
Input switching threshold 9.5V +/- 1V
“On” current = 2.2 mA
integrated 32-bit pulse counter
Network: 10/100BaseT autosensing
Power supply: 12-24V DC (approx. 100mA@24V)
Galvanic isolation: Digital in-/outputs – network: min. 1000 V
Adapters: 1 x 11x screw terminal for IOs and supply
1 x RJ45 for network
Indicators: Status LEDs for network
4 LEDs for digital status

Data transmission:

Protocols: HTTP and HTTPS
TCP and UDP sockets, client and server
MQTT – Publish and Subscribe
SNMP including traps
SMTP e-mail sending
OPC server
Modbus TCP
Inventory keeping, group management
Response times: Data and switching traffic: typically 12 ms

Housing and other data:

Housing: Plastic housing for top hat rail installation
precise fit for sub-distribution systems
90x45x56mm (lxwxh)
Enclosure rating: IP20
Weight: approx. 140 g
Storage temperature: -25°C – 70°C
Operating temperature: 0°C – 60°C
Permissible relative humidity: 5..95% RH (non-condensing)
Scope of delivery: 1 x Web-IO 4.0 Digital, 4xIn/Out
1 x Quick Guide
Power supply and other accessories can be
ordered separately
Weight 0.2 kg